Double-cavity linkage valve automatic liquid supplement infusion assembly

Abstract

This invention provides a dual-chamber linkage valve automatic fluid replenishment and infusion assembly, relating to the field of medical infusion device technology. It includes an upper chamber, a lower chamber, and a valve seat body sealed between the lower end of the upper chamber and the upper end of the lower chamber. The valve seat body has a fluid replenishment channel connecting the inner cavities of the upper and lower chambers. An umbrella-shaped one-way valve is fixedly installed inside the fluid replenishment channel. This umbrella-shaped one-way valve has a forward-guiding and reverse-blocking structure. In this invention, rotating the linkage knob, under the constraint of the rotation limiting mechanism, causes both valve cores to rotate synchronously to the blocking angle, simultaneously cutting off the fluid replenishment channel and completely physically isolating the flow segment where the umbrella-shaped one-way valve is located. This structure, through a single knob linkage between the two valve cores, allows for dual-sided on / off control in a single operation, simplifying clinical operation steps, reducing the risk of misoperation, and compensating for the sealing shortcomings of a single one-way valve by blocking backflow and contamination paths, significantly improving infusion safety and the convenience of tubing operation.

Description

Technical Field

[0001] This invention relates to the field of medical infusion device technology, and in particular to an automatic fluid replenishment infusion assembly with a dual-chamber linkage valve. Background Technology

[0002] In clinical intravenous infusion therapy, automated fluid replenishment infusion units are the core functional components of infusion tubing. They are widely used in various diagnostic and treatment scenarios such as routine drug administration, precision infusion, and intensive care. They mainly play a core role in temporarily storing medication, removing air bubbles from the tubing, and maintaining a stable infusion flow rate. During infusion administration and tubing maintenance, it is required to ensure unidirectional and controllable flow of medication, block blood backflow paths, maintain a uniform and stable outflow rate, and prevent air bubbles from entering downstream tubing. At the same time, it is necessary to simplify operating procedures, reduce the probability of misoperation, ensure the sealing and sterility of tubing operation, and improve the safety and operational efficiency of clinical infusion.

[0003] Currently, most clinically used automatic fluid replenishment and infusion components adopt a single-chamber structure with a single set of one-way valves, relying on gravity pressure difference to achieve automatic fluid replenishment and cessation functions. Some products will add an independent shut-off valve to the pipeline to improve control capabilities.

[0004] However, this type of structure still has many shortcomings: the reverse sealing reliability of a single check valve is limited, and it is prone to slight backflow due to downstream pressure fluctuations, posing a safety hazard; the independent opening and closing operation of multiple valves is cumbersome and prone to misoperation; and it cannot form a physical isolation between the two sides of the check valve, which can easily cause drug dripping and cross-contamination during pipeline replacement and maintenance. At the same time, the single-chamber structure lacks a multi-stage pressure stabilization and buffer design, and pressure fluctuations during infusion can easily cause uneven flow rate and generate air bubbles that can mix into the downstream pipeline, affecting infusion accuracy and treatment safety.

[0005] Therefore, this invention proposes an automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and to propose an automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a dual-chamber linkage valve automatic fluid replenishment and infusion assembly, comprising an upper chamber, a lower chamber, and a valve seat body sealed between the lower end of the upper chamber and the upper end of the lower chamber. The valve seat body has a fluid replenishment channel connecting the inner cavities of the upper and lower chambers. An umbrella-shaped one-way valve is fixedly installed inside the fluid replenishment channel. The umbrella-shaped one-way valve has a forward-guiding and reverse-blocking structure, allowing fluid to flow unidirectionally from the upper chamber to the lower chamber. An integrated linkage double-turn valve assembly is also connected in series on the fluid replenishment channel. The integrated linkage dual plug valve assembly includes an upper plug valve core, which is rotatably disposed in the upstream replenishment channel of the umbrella-shaped check valve. A lower plug valve core is rotatably connected in the downstream replenishment channel of the umbrella-shaped check valve. The rotating shaft ends of the upper and lower plug valve cores are circumferentially provided with linkage knobs for synchronously driving the two valve cores to rotate with a single rotation. A rotation limit mechanism is provided between the linkage knob and the valve seat body. The upper and lower plug valve cores synchronously cut off the replenishment channel, completely physically isolating the upper and lower sections of the channel where the umbrella-shaped check valve is located.

[0008] Furthermore, the umbrella-shaped one-way valve is a valve structure integrally molded from medical elastic material, and the circumferential sealing edge of the umbrella-shaped one-way valve adopts an interference fit sealing configuration.

[0009] The beneficial effects of adopting the above-mentioned further solution are: the use of medical elastic material for one-piece molding has good biocompatibility and elastic recovery ability, can withstand repeated opening and closing fatigue, and the circumferential interference fit of the sealing edge can increase the sealing fit area, effectively improve the reverse sealing performance, reduce the risk of drug leakage and blood backflow, and extend the service life of the one-way valve.

[0010] Furthermore, a gear positioning component is provided between the linkage knob and the valve seat body. The gear positioning component includes a spring, which is installed in the radial hole of the linkage knob. A steel ball is provided in the radial hole of the linkage knob and at the end of the spring. Positioning recesses are provided on the valve seat body corresponding to the fully open and fully closed angles.

[0011] The beneficial effects of adopting the above-mentioned further solution are: the gear positioning structure with spring and steel ball can provide a clear locking feel and feedback when the knob is turned to the corresponding gear, ensuring that the valve core is opened and closed in place, avoiding leakage or obstruction caused by partial opening and closing, eliminating the need to repeatedly check the status, and effectively improving the accuracy and efficiency of clinical operation.

[0012] Furthermore, the upper cavity is a fixed-capacity pre-filled cavity with a sealed top. The top of the upper cavity is provided with a sealed top cover, and the inner wall of the upper cavity is provided with multiple vertical first guide ribs. The top of the upper cavity is reserved with a closed buffer air chamber.

[0013] The beneficial effects of adopting the above-mentioned further solutions are: the fixed-capacity pre-filling chamber can ensure that the single replenishment volume is stable and controllable, the vertical guide ribs can guide the liquid to flow smoothly down the chamber wall, reduce the air bubbles generated by the liquid flow impacting the liquid surface, and the top closed buffer gas chamber can balance the pressure fluctuations in the chamber through gas compression, making the replenishment process more stable and improving the stability of infusion.

[0014] Furthermore, the inner wall of the lower cavity is provided with a vertical second guide rib, and an annular pressure stabilizing air chamber is formed at the upper part of the lower cavity near the valve seat. The cavity wall between the annular pressure stabilizing air chamber and the liquid replenishment channel is thinned to form a flexible buffer thin wall, which is used to absorb fluid pressure fluctuations. A sunken liquid collection tank is provided at the bottom of the lower cavity, and a guide slope is provided around the liquid collection tank. The lowest point of the liquid collection tank is connected to a liquid outlet.

[0015] The beneficial effects of adopting the above-mentioned further solution are: the second guide rib can guide the liquid to flow slowly along the wall, avoiding the generation of air bubbles from impacting the liquid surface and mixing into the downstream; the annular pressure stabilizing air chamber and the flexible buffer thin wall form a double buffer, which can effectively absorb fluid pressure fluctuations and maintain a uniform and stable liquid flow rate; the sinking liquid collection tank and the guide slope can collect the liquid and prevent air from entering the liquid outlet pipeline.

[0016] Furthermore, the valve seat body is formed by the mating and sealing connection of an upper valve seat and a lower valve seat. The umbrella-shaped one-way valve includes an umbrella valve disc and a heat-riveting ring. The edge of the umbrella valve disc is clamped and fixed between the mating surfaces of the upper and lower valve seats. The center part of the umbrella valve disc is pressed and fixed by the heat-riveting ring. An annular flow-blocking boss protruding towards the umbrella valve disc is provided in the upper valve seat. The annular flow-blocking boss is used to prevent the incoming fluid from directly impacting the valve surface.

[0017] The beneficial effects of adopting the above-mentioned further solutions are: the split valve seat structure facilitates the assembly and positioning of the umbrella-shaped check valve, the edge clamping and center hot riveting fixing method is stable and reliable, the sealing performance is excellent, the annular flow-blocking boss can change the direction of liquid inlet flow, avoid high-speed liquid flow directly impacting the valve and causing fatigue damage, effectively extend the service life of the check valve, and make the opening and closing action more stable.

[0018] Furthermore, an upper sealing ring is provided between the upper stopcock valve core and the inner wall of the flow channel of the upper valve seat, and a lower sealing ring is provided between the lower stopcock valve core and the inner wall of the flow channel of the lower valve seat. Vertical anti-slip ribs are provided on the outer peripheral surface of the linkage knob, and visual markings corresponding to the fully open and fully closed positions are provided on the outer end face of the linkage knob.

[0019] The beneficial effects of adopting the above-mentioned further solutions are: the upper and lower sealing rings can fill the gap between the valve core and the flow channel wall, effectively improving the rotational sealing performance of the plug valve core and eliminating the risk of side leakage; the vertical anti-slip ribs can increase the friction of the knob surface, making it less likely to slip even when operating with medical gloves; and the visual indication of the gear position can intuitively display the working status, reducing the probability of operational misjudgment.

[0020] Furthermore, the bottom of the lower cavity is provided with a lower cavity bottom cover, and the lower cavity bottom cover is provided with a drug injection port, which is equipped with a removable drug injection port sealing plug.

[0021] The beneficial effects of adopting the above-mentioned further solutions are: the integrated drug delivery port structure can complete temporary clinical drug delivery without disassembling the overall components or interrupting the main infusion route, making the operation convenient and flexible. The removable sealing plug can ensure the sealing of the pipeline before and after drug delivery, effectively preventing external contaminants from entering the infusion pipeline and improving the safety of clinical drug delivery operations.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0023] In this invention, during operation, the linkage knob is in the fully open position, and the upper and lower stopcock valve cores open simultaneously, ensuring the entire infusion channel is unobstructed. The medication in the upper cavity flows through the upstream channel under gravity, passes through the umbrella-shaped one-way valve in the forward direction, and enters the downstream channel, finally converging into the lower cavity, achieving one-way automatic infusion. When it is necessary to shut down or maintain the pipeline, rotating the linkage knob causes both valve cores to rotate synchronously to the cutoff angle under the constraint of the rotation limit mechanism, simultaneously cutting off the infusion channel and completely physically isolating the upper and lower sections of the flow channel where the umbrella-shaped one-way valve is located. This structure, through a single knob linkage of two valve cores, can complete the on / off control of both sides in a single operation, simplifying clinical operation steps, reducing the risk of misoperation, and the physical isolation on both sides compensates for the sealing shortcomings of a single one-way valve, blocking backflow and contamination paths, significantly improving infusion safety and the convenience of pipeline operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to the present invention;

[0025] Figure 2 This is a schematic diagram of the upper cavity structure of an automatic fluid replenishment and infusion assembly with a dual-cavity linkage valve according to the present invention;

[0026] Figure 3 This is a cross-sectional view of the upper cavity structure of an automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to the present invention;

[0027] Figure 4 This is a schematic diagram of the lower cavity structure of an automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to the present invention;

[0028] Figure 5This is a cross-sectional view of the lower cavity structure of an automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to the present invention.

[0029] Figure 6 This is a schematic diagram of the internal structure of the lower chamber bottom cover of an automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to the present invention;

[0030] Figure 7 This is a schematic diagram of the valve seat structure of an automatic fluid replenishment and infusion assembly for a dual-chamber linkage valve according to the present invention.

[0031] Figure label:

[0032] 1. Upper cavity; 11. First guide rib; 12. Buffer air chamber; 13. Sealed top cover;

[0033] 2. Lower cavity; 21. Second guide rib; 22. Annular pressure-stabilizing air chamber; 23. Flexible buffer thin wall; 24. Liquid collection tank; 25. Guide slope; 26. Liquid outlet;

[0034] 3. Valve seat body; 31. Upper valve seat; 311. Annular baffle boss; 32. Lower valve seat;

[0035] 4. Umbrella-shaped check valve; 41. Umbrella valve disc; 42. Hot-riveted compression ring;

[0036] 5. Upper plug valve core; 51. Upper sealing ring;

[0037] 6. Lower plug valve core; 61. Lower sealing ring;

[0038] 7. Linkage knob; 71. Anti-slip ribs;

[0039] 8. Gear positioning assembly; 81. Spring; 82. Steel ball;

[0040] 9. Lower cavity bottom cover; 91. Drug injection port; 92. Drug injection port sealing plug. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1-7As shown, this embodiment provides a technical solution: a dual-chamber linkage valve automatic fluid replenishment and infusion assembly, including an upper chamber 1, a lower chamber 2, and a valve seat 3 sealed between the lower end of the upper chamber 1 and the upper end of the lower chamber 2. The valve seat 3 has a fluid replenishment channel connecting the inner cavities of the upper chamber 1 and the lower chamber 2. An umbrella-shaped one-way valve 4 is fixedly installed inside the fluid replenishment channel. The umbrella-shaped one-way valve 4 has a forward-guiding and reverse-blocking structure, allowing fluid to flow unidirectionally from the upper chamber 1 to the lower chamber 2. An integrated, linked double-turn valve assembly is also connected in series on the replenishment channel. The integrated, linked double-turn valve assembly includes an upper turn valve core 5, which is rotatably mounted in the replenishment channel upstream of the umbrella-shaped check valve 4. A lower turn valve core 6 is rotatably connected in the replenishment channel downstream of the umbrella-shaped check valve 4. A linkage knob 7 is circumferentially mounted on the ends of the rotating shafts of the upper and lower turn valve cores 5 and 6, which is used to synchronously drive the two valve cores to rotate with a single rotation. A rotation limit is provided between the linkage knob 7 and the valve seat body 3. The mechanism, with its upper and lower stopcock valve cores 5 and 6 simultaneously cutting off the replenishment flow channel, completely physically isolates the flow channel section where the umbrella-shaped check valve 4 is located. During operation, the linkage knob 7 is in the fully open position, and the upper and lower stopcock valve cores 6 open simultaneously, ensuring the entire replenishment flow channel is unobstructed. The liquid in the upper chamber 1 flows through the upstream flow channel under gravity, passes through the umbrella-shaped check valve 4 in the forward direction, and enters the downstream flow channel, ultimately converging into the lower chamber 2, achieving one-way automatic replenishment. To shut down or maintain the pipeline, rotate... With the linkage knob 7 in place, the two valve cores rotate synchronously to the cut-off angle under the constraint of the rotation limit mechanism, simultaneously cutting off the infusion flow channel and completely physically isolating the flow channel section where the umbrella-shaped check valve 4 is located. This structure, through the linkage of two valve cores with a single knob, can complete the on / off control of both sides in a single operation, simplifying clinical operation steps, reducing the risk of misoperation, and the physical isolation on both sides makes up for the sealing shortcomings of a single check valve, which can block backflow and contamination paths, significantly improving infusion safety and the convenience of pipeline operation.

[0043] like Figure 7As shown, the umbrella-shaped one-way valve 4 is a valve structure integrally molded from medical-grade elastic material. The circumferential sealing edge of the umbrella-shaped one-way valve 4 adopts an interference fit sealing configuration, integrally molded from medical-grade elastic material, possessing good biocompatibility and elastic recovery capability, and can withstand repeated opening and closing fatigue. The circumferential interference fit sealing edge increases the sealing contact area, effectively improving reverse sealing performance, reducing the risk of drug leakage and blood reflux, and extending the service life of the one-way valve. A position positioning assembly 8 is also provided between the linkage knob 7 and the valve seat 3. Component 8 includes a spring 81, which is installed in the radial hole of the linkage knob 7. A steel ball 82 is provided in the radial hole of the linkage knob 7 and at the end of the spring 81. The valve seat body 3 is provided with positioning recesses corresponding to the fully open and fully closed angles. The position positioning structure of the spring 81 and the steel ball 82 can provide a clear locking feel and feedback when the knob is turned to the corresponding position, ensuring that the valve core is opened and closed in place, avoiding leakage or obstruction caused by partial opening and closing, eliminating the need for repeated confirmation of status, and effectively improving the accuracy and efficiency of clinical operation.

[0044] like Figures 1-3 As shown, the upper cavity 1 is a fixed-capacity pre-filled cavity with a sealed top. The top of the upper cavity 1 is provided with a sealed top cover 13. The inner wall of the upper cavity 1 is provided with multiple vertical first guide ribs 11. The top of the upper cavity 1 has a reserved closed buffer air chamber 12. The fixed-capacity pre-filled cavity can ensure that the single replenishment volume is stable and controllable. The vertical guide ribs can guide the liquid to flow smoothly down the cavity wall, reducing the air bubbles generated by the liquid flow impacting the liquid surface. The top closed buffer air chamber 12 can balance the pressure fluctuation in the cavity through gas compression, making the replenishment process more stable and improving the infusion stability.

[0045] like Figure 5 As shown, the inner wall of the lower cavity 2 is provided with a vertical second guide rib 21. An annular pressure stabilizing air chamber 22 is formed at the upper part of the lower cavity 2 near the valve seat body 3. The cavity wall between the annular pressure stabilizing air chamber 22 and the liquid replenishment channel is thinned to form a flexible buffer thin wall 23. The flexible buffer thin wall 23 is used to absorb fluid pressure fluctuations. A sunken liquid collection tank 24 is provided at the bottom of the lower cavity 2. A guide slope 25 is provided around the liquid collection tank 24. The lowest point of the liquid collection tank 24 is connected to the liquid outlet 26. The second guide rib 21 can guide the liquid to flow slowly along the wall to avoid impacting the liquid surface and generating air bubbles that mix into the downstream. The annular pressure stabilizing air chamber 22 and the flexible buffer thin wall 23 form a double buffer, which can effectively absorb fluid pressure fluctuations and maintain a uniform and stable liquid outlet flow rate. The sunken liquid collection tank 24 and the guide slope 25 can collect the liquid and prevent air from entering the liquid outlet pipeline.

[0046] like Figure 7As shown, the valve seat body 3 is formed by the mating and sealing connection of the upper valve seat 31 and the lower valve seat 32. The umbrella-shaped check valve 4 includes an umbrella valve disc 41 and a heat-riveting ring 42. The edge of the umbrella valve disc 41 is clamped and fixed between the mating surfaces of the upper valve seat 31 and the lower valve seat 32. The center of the umbrella valve disc 41 is pressed and fixed by the heat-riveting ring 42. An annular flow-blocking boss 311 protruding towards the umbrella valve disc 41 is provided inside the upper valve seat 31. The annular flow-blocking boss 311 is used to prevent the incoming fluid from directly impacting the valve surface. The split valve seat structure facilitates the assembly and positioning of the umbrella-shaped check valve 4. The edge clamping and center heat riveting fixing method is stable and reliable, with excellent sealing performance. The annular flow-blocking boss 311 can change the direction of the inlet flow and prevent high-speed liquid flow from directly impacting the valve. The membrane is fatigue-damaged, effectively extending the service life of the one-way valve and making the opening and closing action smoother. An upper sealing ring 51 is provided between the upper plug valve core 5 and the inner wall of the flow channel of the upper valve seat 31, and a lower sealing ring 61 is provided between the lower plug valve core 6 and the inner wall of the flow channel of the lower valve seat 32. The outer peripheral surface of the linkage knob 7 is provided with vertical anti-slip ribs 71, and the outer end face of the linkage knob 7 is provided with visual markings corresponding to the fully open and fully closed positions. The upper sealing ring 51 and the lower sealing ring 61 can fill the gap between the valve core and the flow channel wall, effectively improving the rotational sealing performance of the plug valve core and eliminating the risk of side leakage. The vertical anti-slip ribs 71 can increase the friction of the knob surface, making it less likely to slip when operating with medical gloves. The position visual markings can intuitively display the working status and reduce the probability of operation misjudgment.

[0047] like Figure 4 as well as Figure 6 As shown, the bottom of the lower cavity 2 is provided with a lower cavity bottom cover 9, and a drug injection port 91 is provided on the lower cavity bottom cover 9. The drug injection port 91 is equipped with a removable drug injection port sealing plug 92. The integrated drug injection port 91 structure can complete the clinical temporary drug injection without disassembling the overall component or interrupting the main infusion route. The operation is convenient and flexible. The removable sealing plug can ensure the sealing of the pipeline before and after drug injection, effectively preventing external contaminants from entering the infusion pipeline and improving the safety of clinical drug injection operation.

[0048] Working principle:

[0049] like Figures 1-7As shown, under normal fluid replenishment conditions, the linkage knob 7 is in the fully open position. The position is maintained stable by the positioning action of the spring 81 and steel ball 82 in the position positioning component 8. The upper stopcock valve core 5 and the lower stopcock valve core 6 open synchronously, ensuring the fluid replenishment channel is fully open. The pre-stored medication in the upper cavity 1 flows downwards under gravity, entering the valve seat body 3 through the upper stopcock valve core 5. The annular baffle 311 buffers and guides the fluid flow, preventing direct impact on the umbrella-shaped one-way valve 4 valve diaphragm. When the liquid pressure reaches the opening threshold, the medical elastic material umbrella valve 41 deforms and conducts in the forward direction. The circumferential interference seal structure ensures reverse shut-off performance. The medication flows into the lower cavity 2 through the lower stopcock valve core 6. As the medication flows through the upper cavity 1, it flows down the wall along the first guide rib 11. The top-sealed buffer chamber 12 balances the pressure fluctuations within the cavity through gas compression. After entering the lower cavity 2, it flows slowly along the second guide rib 21, preventing air bubbles from being mixed in and impacting the liquid surface. Downstream, the annular pressure-stabilizing chamber 22 and the flexible buffer thin wall 23 work together to absorb pressure fluctuations and maintain stable pressure at the outlet. The liquid is collected by the guide slope 25 into the sinking liquid collection tank 24 and smoothly output to the downstream infusion pipeline from the lowest point outlet 26. The upper sealing ring 51 and the lower sealing ring 61 fill the gap between the valve core and the flow channel wall, ensuring the sealing performance of the stopcock rotation throughout the process and eliminating the risk of side leakage. When it is necessary to shut down the infusion or maintain the pipeline, turn the linkage knob 7 to the fully closed position under the constraint of the rotation limit mechanism. The steel ball 82 is locked into the corresponding positioning recess to form a locking tactile feedback. The two valve cores simultaneously cut off the replenishment flow channel, completely physically isolating the upper and lower flow channel section where the umbrella-shaped one-way valve 4 is located, blocking the backflow of the liquid and the path of contamination. When adding medicine temporarily in the clinic, there is no need to disassemble the entire pipeline. Just remove the medicine inlet sealing plug 92 to inject medicine into the lower chamber. Resetting the sealing plug will restore the sealed state. The operation is convenient and does not interrupt the infusion process.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A dual-chamber linkage valve automatic fluid replenishment and infusion assembly, comprising an upper chamber (1), a lower chamber (2), and a valve seat (3) sealed between the lower end of the upper chamber (1) and the upper end of the lower chamber (2), wherein the valve seat (3) has a fluid replenishment channel communicating with the inner cavities of the upper chamber (1) and the lower chamber (2), and an umbrella-shaped one-way valve (4) is fixedly installed inside the fluid replenishment channel, wherein the umbrella-shaped one-way valve (4) is a forward-guiding and reverse-blocking structure, allowing fluid to flow unidirectionally from the upper chamber (1) to the lower chamber (2), characterized in that, An integrated linkage double stopcock valve assembly is also connected in series on the replenishment channel. The integrated linkage double stopcock valve assembly includes an upper stopcock valve core (5). The upper stopcock valve core (5) is rotatably set in the replenishment channel upstream of the umbrella-shaped check valve (4). A lower stopcock valve core (6) is rotatably connected in the replenishment channel downstream of the umbrella-shaped check valve (4). A linkage knob (7) is circumferentially set at the rotating shaft ends of the upper stopcock valve core (5) and the lower stopcock valve core (6) for synchronously driving the two valve cores to rotate in a single rotation. A rotation limit mechanism is provided between the linkage knob (7) and the valve seat body (3). The upper stopcock valve core (5) and the lower stopcock valve core (6) synchronously cut off the replenishment channel, completely physically isolating the upper and lower sections of the channel where the umbrella-shaped check valve (4) is located.

2. The automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to claim 1, characterized in that: The umbrella-shaped one-way valve (4) is a valve structure integrally formed from medical elastic material, and the circumferential sealing edge of the umbrella-shaped one-way valve (4) adopts an interference fit sealing configuration.

3. The automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to claim 1, characterized in that: A gear positioning component (8) is also provided between the linkage knob (7) and the valve seat body (3). The gear positioning component (8) includes a spring (81). The spring (81) is installed in the radial hole of the linkage knob (7). A steel ball (82) is provided in the radial hole of the linkage knob (7) and at the end of the spring (81). A positioning recess is provided on the valve seat body (3) corresponding to the two angles of fully open and fully closed.

4. The automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to claim 1, characterized in that: The upper cavity (1) is a fixed-capacity pre-filled cavity with a sealed top. The upper cavity (1) is provided with a sealed top cover (13). The inner wall of the upper cavity (1) is provided with multiple vertical first guide ribs (11). The top of the upper cavity (1) is reserved with a closed buffer air chamber (12).

5. The automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to claim 1, characterized in that: The inner wall of the lower cavity (2) is provided with a vertical second guide rib (21). An annular pressure stabilizing air chamber (22) is formed at the upper part of the lower cavity (2) near the valve seat body (3). The cavity wall between the annular pressure stabilizing air chamber (22) and the liquid replenishment channel is thinned to form a flexible buffer thin wall (23). The flexible buffer thin wall (23) is used to absorb fluid pressure fluctuations. A sunken liquid collection tank (24) is provided at the bottom of the lower cavity (2). A guide slope (25) is provided around the liquid collection tank (24). The lowest point of the liquid collection tank (24) is connected to the liquid outlet (26).

6. The automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to claim 1, characterized in that: The valve seat body (3) is formed by the upper valve seat (31) and the lower valve seat (32) being sealed together. The umbrella-shaped one-way valve (4) includes an umbrella valve flap (41) and a hot riveting ring (42). The edge of the umbrella valve flap (41) is clamped and fixed between the mating surfaces of the upper valve seat (31) and the lower valve seat (32). The center of the umbrella valve flap (41) is pressed and fixed by the hot riveting ring (42). An annular flow-blocking boss (311) protruding towards the umbrella valve flap (41) is provided in the upper valve seat (31). The annular flow-blocking boss (311) is used to block the incoming fluid from directly impacting the valve surface.

7. The automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to claim 6, characterized in that: An upper sealing ring (51) is provided between the upper stopcock valve core (5) and the inner wall of the flow channel of the upper valve seat (31), and a lower sealing ring (61) is provided between the lower stopcock valve core (6) and the inner wall of the flow channel of the lower valve seat (32). A vertical anti-slip rib (71) is provided on the outer peripheral surface of the linkage knob (7), and a visual mark corresponding to the fully open and fully closed positions is provided on the outer end face of the linkage knob (7).

8. The automatic fluid replenishment and infusion assembly with a dual-chamber linkage valve according to claim 1, characterized in that: The bottom of the lower cavity (2) is provided with a lower cavity bottom cover (9), and the lower cavity bottom cover (9) is provided with a drug injection port (91), and the drug injection port (91) is equipped with a removable drug injection port sealing plug (92).

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